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Q: What one is a prime number 21 23 25?

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Only 23 is a prime number.

19 and 23 are prime.

21 22 23 24 which is the prime number

There is an infinite number of prime numbers that are greater than 21. The next prime number after 21 is 23.

19 and 23 are prime numbers whereas 21 is a composite number

No, it cannot be done. As 23 is odd, two numbers used would have to be one odd and one even. As 2 is the only even prime number and 21 + 2 equals 23, but 21 is not a prime number, it cannot be done.

19 is a prime number. Its only factors are 1 and 19. 21 is a composite number. Its factors are 1, 3, 7, and 21. 23 is a prime number. Its only factors are 1 and 23.

No, they are three numbers, not one. 21 is composite.

21 = 3 x 7, so it is not a prime number. 23 = 1 x 23, it does not have any other factors, so it is a prime number. 25 = 5 x 5, so it is not a prime number.

23

21 = 3x7 ... not prime. 22 = 2x11 ... not prime. 23 is prime. 23.

23

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